In the month since my last update, I’ve lost about half a stone, so the Wii Fit regime is definitely working. Though technically, it’s not really the Wii Fit regime; I use the Body Test facility to keep track of weight, and run through its muscle workouts now and again (though I could probably figure out how to do sit ups and press ups without the plastic board, if I tried really hard), but I suspect most of the weight loss has come from dieting (drinking lots of water instead of sugary carbonated beverages, eating more fresh fruit and all that) and putting in more time on the exercise bike (while listening to the radio).
So is Wii Fit a waste of money? Rationally, yes, as per the previous update you could get a similar benefit from a workout DVD, set of scales and a notepad (and maybe some graph paper and coloured pencils), and even then I suspect all that is secondary compared to eating less/more healthily (I wasn’t particularly unfit previously, just carrying a bit of extra weight). But… despite, on several occasions over the past five years, making a bit of an effort to lose weight, it’s only since getting Wii Fit that I’ve managed to stick at it, so I’m not sure it can be entirely discounted from the equation, even if just as a psychological spur to stick at the diet to keep losing weight to prove it wasn’t a waste of money.